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Topic: NOS Idler Arm vs Factory Original (Read 4789 times)

I just purchased an NOS idler arm for my '69 Z. I have read there are some differences between the factory originals and NOS service replacements however the part I received was "missing" the cotter pin hole which struck me as a manufacturing defect. I was later told that NOS idler arms used an oval locking nut rather than the common castellated nut and cotter pin combination. Can anyone validate this observation?

Here's a close-up of the idler arm from my Z (04B, Van Nuys Build). Note hole for cotter pin and "C" stamp. Car had about 70,000 miles on it, all SoCal. No reason to believe it or any suspension components were replaced (many still had original factory markings).

Thanks for the feedback and photos. Its clear the NOS Idler Arm I located is a later, service replacement and differs somewhat from the factory original. I located a nice original and installed that instead.